SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcdf5a0b550c808c450c79d78cdb472e1d43ac3083e402247633664b56567fee' 
  AND token = 'qcMBPfpSaqfNwYP/V6FVwFprHWVJZIhIyvylcUFhJUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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