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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57a640ed10f685e6ee2fb5d5ad186a0cb4ea75f44fb09db7793a4f5cec074cc6' 
  AND token = '+FwsOt6GYWsI3dtkq5TsMheg7n/C06wRekIkwLH1r+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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