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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd855f7bb089d16f2d8c4dc3a377a46360f68493188da2819f8c3879ed704862' 
  AND token = 'Uon+YOaRXR+NdGdhuBFn9yquBvwa7BxpCQnNpnJc16U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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