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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cdfc769d45bf412cd03b4f3af7516a81a4b81012f16a602d86c480afeb6470d' 
  AND token = 'HDLM0n9o8sz/pLGiep6tuCrlcGKRtAoAb0x5GdeyNJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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