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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c16e7f4912d3c19d7e22edc11169b3407c2f1ba15e9b5f1154fb3d8b9d74039' 
  AND token = 'kvYackJSAceCfdXKSVo8SPBfHrN0MVGu1Vc/jgWk2wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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