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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ae69bb9356a8cb791ad350e1c283daf8dfb361408b64f94c5d223d283b7f04' 
  AND token = 'rrTwVVj1IPflAAqrpG4yUPwAHEgTcSFMPbI3TuqxbwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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