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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2468ed6fe3098a29eac0ae6d58d129439718e245594dc5f8b7ae23db378bc8e9' 
  AND token = 'V3vplT5eWn74/4Cgil1khQeTujf8PJOGm/LzAsZiEQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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