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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70df4d572ea09ed8ea400607be4af70ff9d3ca217bee2622e15fb1a87b14a60c' 
  AND token = '//6gpFWJ5XZoXgrk70Q7UWig9E3nuEY6/axq+8WOIOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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