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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44fd3325aa987ac9340210c4d15e5ed2a4a618c57058ebe89185002460cab08d' 
  AND token = 'D1Lenom9mob/fqjAW8wJjklbUNCrWuhgo2GIhX4qtO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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