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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e1787fcb6add390a09ed0412b0aba80248497fe01b3ec4179e9d2cca111f02' 
  AND token = 'CAliFMzOFqWJRl8Bvv4a/YubCYjou1A8SHFyJ4KYRFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}