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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ffd72e002cb33271f9bb7dd9bedaf68e55aed7b8149b89b8e0bf2308bec33a' 
  AND token = 'QXkN2eZvUvggWj4kFZtBVTEKulorAVh1SprKi6jvCgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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