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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19aca8d20a45255f14d61ea0e8ded0f148cde0fd72948d7af603082d7da375ff' 
  AND token = 'Zk8pAw7ISsf2g3xZIFOY3kcRTqFtlZB7RDc7ZX9p5v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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