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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '353170e2fb259f08fa8a41ab8060d85c57fe26d77f511725d1f9924e343ab474' 
  AND token = 'wRp/7D3d+9qAu5RTKYeb9Ov4Lln8ynRgFcUDFQLricY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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