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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '000b969c6f1a34a395516d174278f62091526ea2e4dd65923f75ddbbb25acc62' 
  AND token = 'T3SFf5ZAdM1EmDhcttE9O3nBwGYoUZFgtsaVwSOXcHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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