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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8524416e61cdf9c41fe0cf79af0f8e56105e44b64c7b3b40f7c15df4bca9047c' 
  AND token = '8I1SQiVl4RdgIWZ8WH8fN6o2tEbjbnZMUUPPQJcKY+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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