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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5153c6dd05dd9f6feaa9e2b9b943dedb6ef10cf139ffe956411d1ded104cf6f' 
  AND token = '2dHEhpNw5mz8v+o28TbMR76osuYVbbYgXCXofdAw1dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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