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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08dfa4e91ffb85b87a8407c5af038da0f402a7c0fcdcf8f620c9de89170a70bd' 
  AND token = 'Kkb0PKl3ubshB5gUcZl+Y8+7P435ASsvtJS3oHsMLg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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