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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8250b24f9f01f89dad93b8a30faa39e4cb3a7283abc522afd34241ef81d8b13f' 
  AND token = 's36D6WRB4z8BZeJMczwve+7ZyNl93C0GeRJwKTn73Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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