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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcee8d47d1a1a697a08379ffe20a5a310dcc5c8a34cc899a036397bf45c91510' 
  AND token = 'h1HXOb4I+tdp+fB7DASKJfInMqB9LLiVpIfIRUSHvQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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