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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f4921452a64744e0113332cc3b9b7b2aa00d7e0b3277ff14c950a25a4331624' 
  AND token = 'uHYp33RaGgY3u+05SLQ7Zpnmn9qG0l6Szl27nztAgik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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