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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69b19e709115ed321186b649a27e38ca902a6b7c1f727bdc972649f4f1f83ffa' 
  AND token = '15+RUBBBv+J0UEraneu2AtzgNp6ebnmO1dRuHANn2NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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