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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b7c283fbdc307ccd8a75da1de814b28cbde4909f9bb2670baefc7e1625e0bd4' 
  AND token = 'HJeOs7XzlzOog3Rxzmaviqxn+8rTDweaEI3EDtuQDWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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