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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fe2b9e315cbfa43fd796039ea66f1c9c6c2412e6bef073a1354cdde6b00be9e' 
  AND token = 'aCzFtb7KN3ax2oT4kFfeGcJ4N7StirtnU94piu5QYVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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