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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3682608549f0cf4f41b3b101f364b9c9119d8e63f86ec41e9194f941a428b8aa' 
  AND token = 'tlAPLeHLmZoWyb6OFzCRAaWJPo7qViKd9/TIleef8LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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