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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '466cdf0002c3e9caf4dfad9d7e282db68e3c6d1eab330fc0a68bc9f9c65f8f86' 
  AND token = 'YE2N773Zt7t/kIUlkCjotmT8uBaiUwJzon3vLlsS64c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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