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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38b26175e6ce9c6ac30cc47b57a25c9cbbcf1002d622a23554a1bb061f474d25' 
  AND token = 'e1fbw8wMoM9cfOULwfXJGoGDBPrmTywWcBU7xWTnYwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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