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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bee5ac1c9d1842f7cd79d1b9d3db3e5b5c771985c127d546cfec7332ac2194ee' 
  AND token = '2Md73/6Sc3wX3HI7IQLtZP71TLqax+gTUciLm68r4fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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