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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6882e09bf827f66fb99dc55009c0b935e4a8d463e3318365d6f19c38994600a6' 
  AND token = 'Fh3N93KgD/6etDIlvjdgFyf0ukJYzcVhiyS592yQDlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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