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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ae6a0108c1c5b505f56a3d55fd3e5c29d8fbb4aaf617c3a749b9a3e549bebce' 
  AND token = 'z6tD/zb3DXdOS7QWj0xoG7f4qzEEV7nKRczVSWV/jng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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