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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59434e1648b5b4d2641cc7aa302436fc13b039b790a30035e44e62034113ec12' 
  AND token = '1I8iNXU0LwSe0cWBXKql2BY8g6490a9KiYuNZkkguG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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