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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '117ac029335980be7487bc9fca6b7c59b0b8ee93d5accab639cabac8a6632d27' 
  AND token = '6nFGWlLPXrQp6ET8GSRSMxHkXJqdxvWp7OvtVpj9pJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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