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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '805718456c268409d49d96045f45a0405d8f2bf2cda23004e442d250082596d2' 
  AND token = '2SHsQAQ/6vqba0MOEJQQY9LxWENF/c37wfXrKSBpcCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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