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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c950f0a8c5b2f90b19bbe180f2a85e0e24c076428c341e06d4900a79e3f2d40b' 
  AND token = '4j7eWGqp3gwPEc0JbHgZ5kKmxhp6MCkQBDo+gKCpHmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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