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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d5a19cb8586ce43a56a74f951baa75c89c3ff49afca50478503f7f082220821' 
  AND token = '0ofCHZrcMPf7AlISuTkbEg1lH/p5tsDZm0orHTAMT+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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