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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f91bf3339b2f40e0900c1a51e08431a7d59136428ea5bc6051fa37f9efb83e8f' 
  AND token = 'aZOYuInb+w6pFMgVr5YH4ywKMEnrITTJZk6WqweSHHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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