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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dbbd0b0a7633975311f3177c164af91711dba7e2456d107a6fa394ded8da29a' 
  AND token = 'BGGsR71SUQ9jS3U9Tx17YyMK1sZoCY0fFlUFNBb2sTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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