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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e228ee80a6602c9d8c3a4c0ae30b512b22eb9c77c4739c868846dff456f5e73e' 
  AND token = 'h4D6MZV5zrUwhtauy/b3DwKCE0jknBiRJC78od7OAAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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