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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd738863e4ed0865622bdcb24400e0e6b698e4beb7e7eb2f49916fc59187cd2a5' 
  AND token = 'KHge5xI+uXkA8kBX/z40sRB3TclKY6LjJ5EaKU1oVog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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