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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94379c2e03f9c76dbdb5b5f25a5733619260cfe3acfedeb2b6e83a6613e03457' 
  AND token = 'nMoXAevuLub7b73sDyh9y6AHzSR/IM/6Z0dYD9/qAz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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