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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9c1c7f8c1d8c0ee48ae7f6a86506a984d2edc67db8b3438f9e326186c41b2ca' 
  AND token = '6MsdyylG8udnJXNfj4RsrFxfrBMRX76fcfntVpKMmig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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