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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c1da7751b0c85b1c377d34ade96f84ba944f8a6337a1c4f45eb4d1198539ebe' 
  AND token = '6Kr76WRb6cDmUmSMZJQIol8S0TwwkhKKNTVh/Tk0ea0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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