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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41e35833d0c2d5bd72fa9e4edc7e3f8554dce03064aa4b30a2db8cfd190523d8' 
  AND token = 'C32pFTAlCV0uDjJAgBGGjVrxYUT4CrCOjyXDwcPvoDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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