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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '209ea1020d74533541ceed434f4394564919939403e3dc6457857de2dddf5ba4' 
  AND token = 'TJdf2BJ+PVVyeVc61GVbkPO9GMNWetidTo4sT3bRn4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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