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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edba6307da3a17117c74551b502844799bc600e478d029627deec7ee4962df47' 
  AND token = 'sYizqE9mAO780D2qxPF5vPNIhCDof/A4orOwyiDDfbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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