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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7738b36fce7f79d24a8a264c952e9148a254a4c9929da370b37c8b97376d17d0' 
  AND token = 'b65V57Ym9fXEKB2MOvkl5zaaZiD+Irn6cYqEUvFQDKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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