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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c7e37fd1a6d2e2da73adb14901edfd74ecfb7645c0d46ef9cc529218db0236' 
  AND token = '1TdmumI9jDFeBeQ6clmrKlsdSQGFWasksBcrT+KP0+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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