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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76574b4c2928fe5fabf5dbf46ec4649b30896267b646ec85388ba8a8d64e1fa6' 
  AND token = 'ihx8yaSMVEt2znnYilB4+7spu1ju6ncJI+7dJQQelSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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