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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '676c6db9e394d0266e1fc0fc089dc3832d5c2c4e3953ed6089eb1171d2ee127b' 
  AND token = '6giSGGkySuOluo6+WzNIOcAAsdhJd5/CqGKaGWgXijU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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