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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab56ff565fe5b5f62c73214a81531c9cd39e5617907c32db9f90848c2f9af806' 
  AND token = 'e0xNOgC9d1ag2j4h/a6oXElgB/ZEzeXFQA3rHfmaiqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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