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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d0fe84e15a59f1b3ba960986e404b6005abd7fcb5c004e41d5405e2a8268c44' 
  AND token = '63raGxX3U4W+F6uTbeRlP0BUADu4FNlh/kZqvQB67RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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