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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f8675fa5aa818264a19543b0795aee17394b58a856fdcedb1f9a10caaf53447' 
  AND token = 'DVbhtnNLGjr21CDr99daufM4xxEh0w+5ORnmlqA8L6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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