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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63acae4c498ca9268c850adeec04c9ebc588a6fc748e6e28b61b43f63aa2b815' 
  AND token = 'e8aFO1ZEm24Y2AINQHXG2nUkRnF5sbNge1mijckNN9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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