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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebbf60189cc3d4c568e1ce899d6b44b307b8e874035d0580c75e9cb003018d15' 
  AND token = 'fMBakWnHY/ywah1l3F5yuw8fwJGhAQSFFvF+HzvdjcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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