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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c2874ce0db847b4ae7ef83fb3e2bd55d42e9b73c5e5121a76a9fc5bd11eb7b6' 
  AND token = '7nHl9YuNkd0T8lyCw54/ih/EqACiqDqYg9qEOmWnUd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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