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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a540d92a631e1f6d8834703055c95a6f9c8217d961b82b62dc9f5c25bcb78916' 
  AND token = 'pHR3lbW6jazq0ecEfvrA2riBgh7jdzmz9I+5OsDmwMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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