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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11992fd703ada535ea935edd59c734e764410e3d3c826e78670c990d3ceb1cbd' 
  AND token = '/XOK/taoe0ogOMCb8SwhmzoBQ1Q+gNq28JGYnGTL3Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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