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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a495dde6ed293b34e895a363cddb7b6e3d00b54c4325a43f385875ffe6da9c7' 
  AND token = 'mgB7cqFJaFgFjYKJUJDoLEHOdVpkCTApio/wI9mE3N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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