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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b3c7449b5cdd28d2db88bed2914c37f5894fb357b8e4bc7fefbdfb1acc05e2f' 
  AND token = '/bAWZcLe73HlBYDeFk4lZcl9/kx+UxwhDMIwWGZFJmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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