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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afba4bc0cb91a7645d9b1a03f27b75ad569d2e006904cb62a486dfc62e8487a4' 
  AND token = '7yFE2BCEdjP4mU+vAQsAqfscsTIz+TzE/A8p1oJcIqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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