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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac91fe35a71e23836af87173f5348a3c4b6c767aa85c4ffeb41f794eb840057' 
  AND token = '5pSrEJ+dE3MlydyDOpadzg5XO2Eqp+6R0J8SaubR9O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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