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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6da6ed0a3f4b3f35b7555ce8062fc1136e60fadc9a95c096cfe9164a423c6f3' 
  AND token = 'Y3HSM4JpYbzY5PzrPx4jBYhqh2UXyhShPw813e6akiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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