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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1485643072e5f0cafd751b6d96b7f1e2b773ecb4c1940e7a90b2fe5f55720c4' 
  AND token = 'Iz3sz4GOJqImAXFqL4ZUr48T8OzpYNcfzGEIb5DVq9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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