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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b2a873f78ede5b442c0a2c0acdf967113eca1f813550716405bf1fd7200ae3b' 
  AND token = 'HFwBc5ZUWAhRBKXAWvE3u0n2HlnFvxE/NrAGY2DPV+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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