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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4cf86bc65a92b713119fcc088a33094945ca004115151a0fed6026769cbd3c8' 
  AND token = 'AxaOMOf01a5LULvX8DyXSGIcBLUiTwQD9Moy67VAAgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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