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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b23fade4d7106003c7d8196dd363cb761b9f896a6394d4ae1fcef6dfa70798' 
  AND token = 'XYV9J4AVcSt8wVxhI5eBQ3vbv3wqB4cXXct0UqXtfwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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