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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05f682321fac9cf3215dfd98b3c8982822ace3309c156216f7682823d47bd28c' 
  AND token = 'jlOSxJHn/rOFFpae5faT/rS4bfp3Z9C019i20SGpZhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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