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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db6ae4e315cfd23a55c7328182c49508387df6033b555d6dcc021f037a3000d9' 
  AND token = 'dafucGgvG16HCW04oxH27lOTBUf9kkSqFNQX3Fix/LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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