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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94002214d7417b75f850800683d271e819d2c0928e6b505d86460214d7064d27' 
  AND token = 'InlZRtjF+1hthCMdTLvVk+GJS2sSkg+V6AMGQgG8JQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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