Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b218ca829b05d5673a9beaaa8d3968a7b0e834773a993908cba38f84234ab1a0' 
  AND token = 'hMxncctQhCisyG/dS4kNoAlUC12jpvffemMDEhrdBR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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