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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a545f374cf3eabfe29b5f8722c141870c87a92dc7e0d7cad5cc5978e24e3bb86' 
  AND token = 'rh9YllL586InLePMENY25gFUvIGbcAwFuM41EikptJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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