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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aa11f00163ca1b52ea320f13a3cd42cd2fb9d5e17c28f925477ab795a172884' 
  AND token = '1gDMpc/ycnBrYG6tXkpNltxP5KNCJZn77SgSQsdY9Tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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