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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f439b5548f64a660809df52835df6bda1367854327a8d775a0e1f90fe5459e' 
  AND token = 'tkaQBqex/5OfJo6tLDAgVW6Nea3tR3hHeSCaddAO+bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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