SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d82e58fc3139c8b5cc7154320d3506c6bf034a5422f5cdf3bcc2f62de4929c2' 
  AND token = 'x14bvDW8F3GCvlL/MA8JBdWLjdZB2z/HYavNPfJjt3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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