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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0c3ec362c98aff6b3dde973707a43f3b20127ec15f0e76fa48b109ce49a7cdd' 
  AND token = 'aj7nW1Q9k3GoZRQVAnqRu9H6lLIkeRjLnkES2iHuq58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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