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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f39e694feb6d4db8520d2211e615913bfc433a92dd6b74d40ec41997d282694c' 
  AND token = 'TqtI9Qs/tj3E0yTmn0YuIlrQuDAz4iyYYoIJ9U/FLTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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