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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '796b60e04a263e18e2dbe5d2e787bc266db24558acea01ec493ad3b45f49a630' 
  AND token = 'CDdUFUxudt55ppko9oMQAYbE9sY/HLX9c0YgB6UTNjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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