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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '092fcb59ad913e45f3f06ea9ebdac636c382300bffd63b3980e3946ea21fe724' 
  AND token = 'GBY0BQUUP8VuyclHrx7Fn2vP6KvsWIIP8NWK0hYJvOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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