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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd427b781be0933ec25f72e75c02b79467b311993a6709564402e71538456f71' 
  AND token = 'YSbmthzIp+/mQxlndIR3Ell8l4+WOwt1YtPulcCbCbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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