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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd421fb6c30cf93d350161402f72d5937a03751c1755792c80bde53c3b493eaca' 
  AND token = 'dxpmK8qkgm05YTd2evdzKGsWOxl1uz3u5XMufRktKP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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